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The most promising approach is explained here: https://github.com/IanWraith/24DownConvert . It seems to easiest to put together (assuming one is familiar with Arduino or any similar device), can be used to downconvert up to 4GHz, and the programmable oscillator would allow to set a precise downconverting frequency to optimize the band for the optimal sensitivity of the SDR used
There is also the third harmonic mixing supported by https://github.com/librtlsdr/librtlsdr, also need input filters and likely a LNA too due to major loss of gain on that high frequency!